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Polymorphism vs Overriding vs Overloading
... point out that it's only polymorphism because which version of goPee() to call can only be determined at runtime. While this example implies that, it is nice to point out why exactly that is polymorphism. Also, it doesn't require sibling classes. It can be a parent-child relationship as well. Or ev...
How do I add 1 day to an NSDate?
Basically, as the title says. I'm wondering how I could add 1 day to an NSDate .
28 Answers
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Dealing with float precision in Javascript [duplicate]
...s[1].length);
}
return function() {
return Array.prototype.reduce.call(arguments, function (prev, next) { return prev === undefined || next === undefined ? undefined : Math.max(prev, _shift (next)); }, -Infinity);
};
})();
Math.a = function () {
var f = _cf.apply(null, arguments); if(f...
Write a program that will surely go into deadlock [closed]
...ic constructor must run no more than once and it must run before the first call to any static method in the class. Main is a static method, so the main thread calls the static ctor. To ensure it only runs once, the CLR takes out a lock that is not released until the static ctor finishes. When the ct...
How do I get the number of elements in a list?
... builtin objects with a "size" in Python, in particular, have an attribute called ob_size, where the number of elements in the object is cached. So checking the number of objects in a list is very fast.
But if you're checking if list size is zero or not, don't use len - instead, put the list in a b...
Seedable JavaScript random number generator
...t Math.random() function returns a random value between 0 and 1, automatically seeded based on the current time (similar to Java I believe). However, I don't think there's any way to set you own seed for it.
...
What is a bus error?
...r when your processor cannot even attempt the memory access requested, typically:
using a processor instruction with an address that does not satisfy its alignment requirements.
Segmentation faults occur when accessing memory which does not belong to your process, they are very common and are ty...
Convert NSData to String?
...
Objective-C
You can use (see NSString Class Reference)
- (id)initWithData:(NSData *)data encoding:(NSStringEncoding)encoding
Example:
NSString *myString = [[NSString alloc] initWithData:myData encoding:NSUTF8StringEncoding];
Remark: Please notice the NSData value must be valid for...
AI助手生成代码编译apk报错 - AI 助手 - 清泛IT社区，为创新赋能！
...ources\app.asar.unpacked\tmp\1781143258366_6476145339306496000-0\youngandroidproject\..\build\intermediates\res\merged\layout\abc_alert_dialog_button_bar_material.xml: note: using v22 attributes; synthesizing resource appinventor.ai_18721201607.BLtalka:layout/abc_alert_dialog_button_bar_material for...
Expression Versus Statement
...was one unit of execution, a thing that you did. The only reason it wasn't called a "line" was because sometimes it spanned multiple lines. An expression on its own couldn't do anything... you had to assign it to a variable.
1 + 2 / X
is an error in FORTRAN, because it doesn't do anything. You ha...